A 240-nA Quiescent Current, 95.8% Efficiency AOT-Controlled Buck Converter With A<sup>2</sup>-Comparator and Sleep-Time Detector for IoT Application

Huang, Wenbin; Liu, Lianxi; Liao, Xufeng; Xu, Chengzhi; Li, Yonyuan

doi:10.1109/tpel.2021.3082896

Cited by 33 publications

(6 citation statements)

References 26 publications

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“…References [32,33] are conventional current mode control. References [34,35] are the COT control same as this paper. It can be seen that the dual modulation adaptive-on-time controlled mode buck converter designed in this paper achieves a better response speed than both the current mode controlled and the conventional constant-on-time controlled converters compared over a wide input and output range, significantly, which keeps the upper and lower overshoot voltage within 60 mV with the load transient response recovery time of about 13 µs and 15 µs.…”

Section: Resultsmentioning

confidence: 99%

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

Sun,

Chen,

Wang

et al. 2023

Micromachines

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This paper proposed a fully integrated adaptive on-time (AOT) controlled buck converter with fast load transient. An adaptive on-time generator is presented to stabilize the output frequency. To enhance the light load efficiency, the converter could transfer from the pulse width modulation (PWM) to pulse skip modulation (PSM) as the load current decreases. The buck converter can switch between these two modulation modes adaptively with the assistance of a zero current detection circuit. Implemented in the TSMC 0.18 µm BCD (BiCMOS/DMOS) process, the proposed buck converter works with an input voltage ranging from 5.5 to 15 V, an output voltage ranging from 0.5 to 5 V, and an output load ranging up to 5 A. The experimental results show that based on the dual modulation adaptive on-time controlled mode, the transient recovery time from light to heavy load and from heavy load to light load is 13 µs and 15 µs, respectively. An overshot voltage of 57 mV and an undershot voltage of 53 mV are also achieved.

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Section: Resultsmentioning

confidence: 99%

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

Sun,

Chen,

Wang

et al. 2023

Micromachines

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“…It can be found from (11) that the value of the sampling current is in linear and positive proportion to the inductor current, so the inductor current can be well sampled. The principle of sampling the inductor current in the charging phase is the same as that in the discharging phase, so it will not be discussed in detail here.…”

Section: Full Cycle Current Sensormentioning

confidence: 99%

“…These requirements are great challenges to battery life. In order to achieve longer battery life, it has become a trend that low power consumption and high efficiency power management chips are integrated into IoT systems [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An ultra‐low quiescent current tri‐mode DC–DC boost converter with 95.6% peak efficiency for internet of things application

Zheng

Song

Guo

et al. 2023

IET Power Electronics

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An ultra‐low quiescent current tri‐mode DC–DC boost converter is proposed in this paper, which can efficiently handle loads from 1 μA to 300 mA, providing 5‐V output from 3 to 4.2‐V input. Hysteresis current mode control is adopted to realize seamless mode switching between continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In order to deal with the light load situation, this paper proposes a quasi burst mode (QBM). In this mode, most of the modules are turned off and only the QBM controller, low‐power current bias and sample and hold circuit are retained, which significantly reduces the static current of the converter, and thus improves the light load efficiency. Meanwhile, the average current of error amplifier and comparator are reduced significantly by dynamic biasing. Finally, the efficiency of the converter is greatly improved and kept at a reasonable output ripple. The proposed converter is implemented in a 0.13‐μm BCD process design and manufacturing. The test results show that the quiescent current of the converter is only 780 nA, which can achieve a peak efficiency of 95.6%, and ensure that the efficiency is maintained above 80% in the load range of 10 μA to 300 mA.

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“…The internal bandgap reference circuit, as the most important module in the DC-DC converters, provides an accurate voltage reference output for the entire chip. It also faces new challenges in terms of its function and performance [1,2,3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

A 0.84-μA bandgap for high step-down DC-DC convertors with thermal compensation and protection

Ren,

Zhao

2024

IEICE Electron. Express

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This paper presents a bandgap reference (BGR) circuit with high precision and low power, which is suitable for wide supply and temperature range DC-DC converters. A thermal compensation method is designed to improve output accuracy. A thermal shutdown detection (TSD) circuit is proposed to prevent overheating. It also adopts a twochannel pre-regulator, which reduces the current consumption and area while enhancing PSRR. The measured results show the temperature coefficient (TC) stands at 5.69 ppm/°C in the range of -40°C to 155°C. The typical current consumption is 0.84μA in the supply range from 3.5 to 40 V. The PSRR is -86dB at 1kHz.

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A 240-nA Quiescent Current, 95.8% Efficiency AOT-Controlled Buck Converter With A²-Comparator and Sleep-Time Detector for IoT Application

Cited by 33 publications

References 26 publications

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

An ultra‐low quiescent current tri‐mode DC–DC boost converter with 95.6% peak efficiency for internet of things application

A 0.84-μA bandgap for high step-down DC-DC convertors with thermal compensation and protection

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A 240-nA Quiescent Current, 95.8% Efficiency AOT-Controlled Buck Converter With A2-Comparator and Sleep-Time Detector for IoT Application

Cited by 33 publications

References 26 publications

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

An ultra‐low quiescent current tri‐mode DC–DC boost converter with 95.6% peak efficiency for internet of things application

A 0.84-μA bandgap for high step-down DC-DC convertors with thermal compensation and protection

Contact Info

Product

Resources

About

A 240-nA Quiescent Current, 95.8% Efficiency AOT-Controlled Buck Converter With A²-Comparator and Sleep-Time Detector for IoT Application